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>> Brr. Whose idea was it
to camp in winter?
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And why is winter so much
colder and darker than summer?
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To understand this,
we need to explain
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how the tilt of the earth's axis affects
the amount of sunshine we get,
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and explain how the tilt of the earth's
axis affects how warm the sun feels.
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The earth spins on its axis.
The fact that it takes 24 hours
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to complete 1 spin helps us
explain day and night,
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but it is the tilt of the earth's axis
that will help us understand the seasons.
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It is tilted at an angle of 23.4 degrees,
and the earth takes 1 year to orbit the sun.
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Different parts of the earth are
tilted towards the sun as it orbits.
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In winter, the Northern Hemisphere
is tilted away from the sun.
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This means fewer hours
each day are spent in daylight.
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In summer, the Northern Hemisphere
is tilted towards the sun.
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This means more hours
each day are spent in daylight.
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The tilt of the earth also affects
the angle that the sun shines
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onto different parts
of the earth.
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In the summer, the sun is shining
more directly at the Northern Hemisphere.
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In the winter, the sun
shines at more of an angle.
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The sun appears higher in the sky
in summer, and lower in the winter.
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The angle of the sun in the winter
spreads the sun's rays over a larger area.
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They are less concentrated,
and so it feels colder.
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So, the earth's tilt really does mean it's
better to go camping in the UK in summer.
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In winter, the Northern
